Keep what an adopted node reports holding, the firewall it found and what is reachable on it (hq ADR 0100)

cmd/mesh-controller/adoption.go

@@ -29,9 +29,40 @@ func showMode(ctx context.Context, inv *inventory.Inventory, node inventory.Node
 	} else {
 		fmt.Printf("  taken             %s\n", strings.Join(taken, ", "))
 	}
+	said, err := inv.AdoptionOf(ctx, node.Name)
+	if err != nil {
+		return err
+	}
+	if said.At.IsZero() {
+		fmt.Printf("  it has not yet said what it found\n")
+		return nil
+	}
+	fmt.Printf("  firewall found    %s\n", orNone(said.Firewall))
+	if len(said.Held) == 0 {
+		fmt.Printf("  holding           nothing found\n")
+	}
+	for _, h := range said.Held {
+		// A held thing that changed is how a predecessor still writing is caught: said first.
+		line := fmt.Sprintf("  holds %-11s %s  %s, for %s", h.Kind, h.Target, h.ID, h.Module)
+		if h.Changed != "" {
+			line += "  — " + strings.ToUpper(h.Changed) + " by something other than the mesh"
+		}
+		fmt.Println(line)
+		if h.Kept != "" {
+			fmt.Printf("  %-17s original kept at %s\n", "", h.Kept)
+		}
+	}
+	fmt.Printf("  as of             %s\n", said.At.Local().Format(time.DateTime))
 	return nil
 }
 
+func orNone(s string) string {
+	if s == "" {
+		return "none reported"
+	}
+	return s
+}
+
 // adoptedNodes are the names of every adopted node, in the order given.
 func adoptedNodes(nodes []inventory.Node) []string {
 	var out []string